48 A CATALOG OF ILLINOIS ALGAE 



E. PECTiNALis var. MINOR (Kuetz.) Rab. Hustedt, loc. cit., p. 298. f. 

 763d-f (1932). 



Thomas & Chase 1887, p. 328: Cook, Chicago— Lake Michigan. 



Suborder: ACHNANTHINEAE 

 Family: ACHNANTHACEAE 



ACHNANTHES Bory, 1822 



A. EXiLis Kuetz. Hustedt in Pascher,Suesswass.-fl. Mitteleur. 10: 198. 

 f. 278 (1930). 



Thomas & Chase 1887, p. 328: Cook, Chicago— Lake Michigan. 

 A. LANCEOLATA (Breb.) Grun. Boyer, Proc. Acad. Nat. Sci. Phila. 79 

 (Suppl. 2): 234 (1927). 



Achnanthidium lanceolatum Breb. 



Transeau, as Achnanthidium lanceolatum: Coles, Charleston — 



small streams (Mar., May); Mattoon — swamp (Apr.). 

 A. LANCEOLATA var. ROSTRATA Hust. Hustedt in Pascher, Suesswass.- 

 fl. Mitteleur. 10: 208. f. 306b (1930). 



Achnanthidium lanceolatum var . dubia Grun. 



Transeau, as Achnanthidium I. var. dubia: Coles, Charleston — 



small streams (Jan., Mar.). 

 A. MiCROCEPHALA (Kuetz.) CI. Boyer, Proc. Acad. Nat. Sci. Phila. 79 

 (SuppL 2): 237 (1927). 



Thomas & Chase 1887, p. 328: Cook, Chicago— Lake Michigan. 

 A. MiNUTissiMA (Kuetz.) CI. Boyer, loc. cit. (1927); Mills, Index 

 Diat., p. 964 (1934). 



M.icroneis minutissima (Grun.) CI. 



Transeau, as Microneis minutissima: Coles, Charleston — pond 



(Nov.). 



COCCONEIS Ehrenberg, 1835; Grunow, 1868 



C. FLEXELLA (Kuetz.) CI. Boyer, loc. cit., p. 248 (1927); Mills, loc. 

 cit., pp. 75, 420, 669 (1934). 



Eucocconeis flexella (Kuetz.) C\.; Achnanthidium flexellum (Breb.) 

 Kuetz. 



Thomas & Chase 1887, p. 328, as Achnanthidium flexellum; 

 Ahlstrom 1936, p. 292, as Eucocconeis flexella: Cook, Chicago, 

 Evanston — Lake Michigan. 

 C. PEDICULUS Ehr. Boyer, loc. cit., p. 244; Mills, loc. cit., pp. 414, 429 

 (1934). 



Cocconeis communis Habirsh. 



Transeau: Coles, Charleston — Indian Creek and ponds (Mar., 

 May, Nov.); Loxa— ditch (Apr.). Briggs 1872A, p. 43; Thomas 

 & Chase 1887, p. 328; Ahlstrom 1936, p. 291: Cook, Chicago, 

 Evanston— Lake Michigan. Kofoid 1903, p. 516; 1908, p. 47, 



